Summary
Multifocal pupillographic objective perimetry using stimuli that engage both cortical and sub-cortical (melanopsin/ipRGC) pathways shows strong diagnostic accuracy for glaucoma, outperforming sub-cortical-only approaches. Lighting designers and clinicians should note that short-wavelength (blue) stimuli targeting melanopsin are confounded by aging and disease, limiting their utility for localized visual field assessment in older populations.
Key Findings
- Stimuli targeting both cortical and sub-cortical pupillary components achieved 100% diagnostic accuracy in eyes with severe glaucomatous visual field damage.
- Diagnostic accuracies of 89% and 84% were obtained for eyes with moderate and mild visual field damage, respectively.
- A slow blue melanopsin-targeting stimulus was unable to detect localized visual field dysfunction and was prone to confounding effects of aging, limiting its clinical utility.
- Direct pupillary responses were uniformly larger than consensual responses to stimulation in the temporal visual field, with little significant difference in the nasal field, informing a new model of midbrain pupillary signal distribution.
- Response amplitudes were influenced primarily by luminance contrast, while latencies were more strongly influenced by color changes; at high luminance-contrast, the luminance signal dominated the color signal.
Categories
Eye Health & Vision: This thesis investigates multifocal pupillographic objective perimetry (mfPOP) as a diagnostic tool for glaucoma detection and visual field assessment.
The Science of Light: The research examines melanopsin-driven ipRGC responses, spectral sensitivity interactions between cortical and sub-cortical pupillary pathways, and the effects of color- versus luminance-contrast stimuli on pupillary responses.
Author(s)
CF Carle
Publication Year
2011
Related Publications
Eye Health & Vision
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Genetic reactivation of cone photoreceptors restores visual responses in retinitis pigmentosa
- Melanopsin and rod–cone photoreceptors play different roles in mediating pupillary light responses during exposure to continuous light in humans
- Characteristic patterns of dendritic remodeling in early-stage glaucoma: evidence from genetically identified retinal ganglion cell types
- Intrinsically photosensitive melanopsin retinal ganglion cell contributions to the pupillary light reflex and circadian rhythm
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice